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RANSOM_HAVOC.A

January 30, 2017
 ALIASES:

Ransom.Havoc (Malwarebytes), Trojan.MSIL.Crypt.crxz (Kaspersky)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It is capable of encrypting files in the affected system.

  TECHNICAL DETAILS

File Size:

219,648 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

16 Jan 2017

Payload:

Connects to URLs/IPs, Encrypts files, Displays graphics/image, Displays message/message boxes

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Process Termination

This Trojan terminates processes or services that contain any of the following strings if found running in the affected system's memory:

  • Taskmgr
  • Antivirus
  • Killer
  • Process
  • Defender
  • AntiMalware
  • Scanner
  • Protection
  • AntiVirus

Other Details

This Trojan renames encrypted files using the following names:

  • {Original filename and extension}.HavocCrypt

It is capable of encrypting files in the affected system.

NOTES:

This ransomware encrypts all files located in the %Desktop% folder. After encrypting the files, it displays the following ransom note:

If the maximum number of tries for the decryption key is reached, it displays the following:

It also displays these message boxes if the time left reaches zero.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

13.162.00

FIRST VSAPI PATTERN DATE:

16 Jan 2017

VSAPI OPR PATTERN File:

13.163.00

VSAPI OPR PATTERN Date:

17 Jan 2017

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Restart in normal mode and scan your computer with your Trend Micro product for files detected as RANSOM_HAVOC.A. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.

Step 3

Restore encrypted files from backup.


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